The data source of a record's geometry. Valid property values are listed in the whosonfirst-sources repository.
Example: "src:geom":"quattroshapes"
The data source of a record's alt-geometry. Valid property values are listed in the whosonfirst-sources repository.
Example: "src:geom_alt":"naturalearth"
The source of a record's lbl properties. Valid property values are generally derived from mapshaper and is also listed in the whosonfirst-sources repository.
Other iterations of the lbl property can include lbl:centroid and centroid_lbl; these properties are specific to the label centroid of a given feature.
Example: "src:lbl":"mapshaper" or "src:lbl:centroid":"mapshaper"